As oil prices have soared in recent weeks, so have retail gasoline prices. But what about 
biofuel prices? Why is the cost of crop-based fuel going up just as fast as regular gas?
A thoughtful reader recently asked me about the pricing of E85, a biofuel that contains 85 percent ethanol, which is made from corn, and 15 percent gasoline; and is available locally at various gas stations.
Here’s the reader’s question and an answer from a University of Tennessee expert.